03-13-2014
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<br />HMG_TO9‐A10_Long.docx 8 <br />c) Additional Unsteady HEC‐RAS Modeling of New PMF Inflows (if authorized). <br />If additional sets of hydrographs need to be developed to determine the PMF at the <br />Fargo gage location, as determined in subtask b, USACE will provide one to four <br />additional sets of hydrographs to be modeled with HEC‐RAS. Prepare update of <br />draft Technical Memorandum prepared in subtask b. <br /> <br />Deliverables: <br />i. Preliminary unsteady HEC‐RAS. <br />ii. Second draft Technical Memorandum. <br /> <br />d) Final Technical Memorandum. <br />Upon review of the model results and draft Technical Memorandum by USACE, <br />finalize the HEC‐RAS models and prepare a Final Technical Memorandum, <br />addressing comments provided by USACE. <br /> <br />Deliverables: <br />i. Final unsteady HEC‐RAS input and output files for the PMF event. <br />ii. Final Technical Memorandum. <br /> <br />VI. UPDATE HEC‐RAS MODEL <br />a) Update the HEC‐RAS model geometry for the revised western alignment from the <br />Maple River to the Sheyenne River and the proposed upstream staging area ring <br />levees. <br />b) Provide on‐going hydrology and hydraulic modeling services as requested in order <br />to keep HEC‐RAS model consistent with project features. <br /> <br />VII. CONNECTING CHANNEL AND 20‐YEAR EXISTING CONDITIONS <br />Scope: <br />a) Connecting Channel Geometry: Update the HEC‐RAS model geometry to <br />incorporate the geometry of the connecting channel between the Wild Rice and <br />Red Rivers. Complete the 10‐yr, 20‐yr, and 50‐yr model runs to determine the <br />proper model modifications and to determine the impacts of the updated <br />geometry. If the modifications affect the 50‐yr model results, complete the 100‐yr, <br />500‐yr, SPF, and PMF model runs to determine the impact of the updated <br />geometry. If the modifications do not affect the 50‐yr model results, the updated <br />100‐yr, 500‐yr, SPF, and PMF model runs will be made under a future authorization. <br />Develop flooded outline polygons and depth grids for the 10‐yr, 20‐yr, 50‐yr, 100‐yr, <br />500‐yr, SPF, and PMF events. <br />b) 20‐year Existing Conditions Modeling: Develop 20‐year Existing Conditions models <br />and provide floodplain mapping for the Staging Area. <br /> <br />Deliverables: <br />a) Preliminary unsteady HEC‐RAS models. <br />b) Final unsteady HEC‐RAS input and output files. <br />c) 20‐year existing conditions model results. <br /> <br />VIII. MAPLE RIVER AQUEDUCT FLOW ANALYSIS <br />a) Conduct modeling of Maple River flows across the proposed Maple River Aqueduct <br />and into the Risk Reduction Area. <br />i. Use the latest HEC‐RAS model for the FMMFRM Project and the best <br />available topographic data. <br />DR <br />A <br />F <br />T
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